Method of Transmitting Messages Between Two Computers Connected to a Network and Corresponding Messaging System

1. A method of transmitting a message ( 5 ) from a first computer ( 1 , 2 , 3 ) to at least one second computer ( 1 , 2 , 3 ), the method comprising, in the first computer, the step of introducing transmission information into a header ( 6 ) of the message, and in the first computer, the step of introducing into the header of the message at least one instruction that can be executed by the second computer to manage a filing space, wherein, once the filing space has been created in the second computer by a message coming from the first computer, the method further comprises the step of sending a message to the first computer having a header containing an instruction for deleting an address of the second computer in the first computer in association with the filing space.

2. A transmission method according to claim 1 , wherein the instruction to manage the filing space is an instruction for creating the filing space in the second computer ( 1 , 2 , 3 ).

3. A transmission method according to claim 2 , further comprising the step of introducing in the header ( 6 ) of the message ( 5 ) at least one item of information for filing the message ( 5 ) in a filing space of the second computer, and wherein the second computer incorporates means for automatically reading said information and for filing the message in the corresponding manner within the second computer.

4. A transmission method according to claim 1 , further comprising the steps of creating a filing space in the first computer ( 1 , 2 , 3 ), of associating it with properties, and of creating the message ( 5 ) to be sent relating to said space, the instruction to manage the filing space being introduced automatically into the header ( 6 ) of the message ( 5 ).

5. A transmission method according to claim 4 , wherein the instruction to manage the filing space comprises an instruction for filing the message in the corresponding filing space of the second computer.

6. A transmission method according to claim 4 , wherein the instruction to manage the filing space comprises an instruction for creating the corresponding filing space in the second computer, the method further comprising the step of introducing the properties of the space into the header of the message simultaneously with introducing the management instruction.

7. A transmission method according to claim 1 , further comprising the step of associating access authorization with at least one message.

8. A transmission method according to claim 7 , wherein the access authorization allows the message to be read and to be replied to.

9. A transmission method according to claim 7 , wherein the access authorization is restricted to reading the message.

10. A transmission method according to claim 7 , further comprising the step of introducing the access authorization in the header of the message.

11. A transmission method according to claim 7 , further comprising the step of introducing the access authorization amongst the properties of a filing space.

12. A transmission method according to claim 1 , the method being implemented by means of a program installed in the first and second computers, the program enabling messages to be sent, messages to be received, and instructions contained in the headers of messages to be executed automatically on reception of the messages.

13. A transmission method according to claim 12 , wherein the program operates using a protocol of the POP3/SMTP type.

14. A transmission method according to claim 12 , wherein the program operates using a protocol of the IMAP4 type.

15. A transmission method according to claim 1 , wherein the transmission information comprises at least an address of the second computer.

16. A transmission method according to claim 15 , wherein the transmission information comprises at least the following information: an identity of the first computer; a time-and-date stamp; the type of messaging program used by the first computer; and a subject matter of the message.

17. A transmission method according to claim 1 , wherein the instruction to manage the filing space is an instruction for deleting access to the filing space in the second computer ( 1 , 2 , 3 ).

18. A transmission method according to claim 1 , wherein the instruction to manage the filing space is an instruction for modifying the properties of a message filing space in the second computer ( 1 , 2 , 3 ).

19. A transmission method according to claim 1 , wherein the instruction to manage the filing space is an instruction for deleting or modifying a message in the second computer ( 1 , 2 , 3 ), providing that the message came from the first computer ( 1 , 2 , 3 ).

20. A transmission method according to claim 1 , further comprising the step of introducing into the header of the message at least one item of information for ordering the message relative to a message that appears at least in the second computer, and wherein the second computer incorporates means for reading said information automatically and for filing the message in corresponding manner in the second computer.

21. A method according to claim 1 , further comprising, in the first computer ( 1 , 2 , 3 ) and prior to transmitting the message, the steps of introducing integrity information into the header ( 6 ) of the message ( 5 ) and of encoding at least said integrity information using an encryption algorithm, and in the second computer, the steps of decoding the integrity information, of verifying whether the integrity information is correct, and if not correct of ignoring the management instruction contained in the header of the message.

22. A transmission method according to claim 1 , further comprising the step of introducing in the header of the message time-and-date stamp information expressed in terms of universal time.